If you'd like to learn more about IPv6, check out the article on computer networks above. If you are new to network engineering, you can get a better idea of how computer networks work here.įinally, this cheat sheet and the rest of the article is focused on IPv4 addresses, not the newer IPv6 protocol. Note that the wildcard is just the inverse of the subnet mask. * /31 is a special case detailed in RFC 3021 where networks with this type of subnet mask can assign two IP addresses as a point-to-point link.Īnd here's a table of the decimal to binary conversions for subnet mask and wildcard octets: Here are the charts, followed by some explanations of what they mean. Just scroll or use Ctrl/Cmd + f to find the value you're looking for. To make your life easier, the freeCodeCamp community has made this simple cheat sheet. As a developer or network engineer, you may need to occasionally look up subnet mask values and figure out what they mean.
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